Double Acting Pneumatic Wafer Butterfly Valve
Double Acting Pneumatic Wafer Butterfly Valve; a wafer-type butterfly valve clamped between two flanges with bolts, with an ISO 5211-mounted rack-and-pinion pneumatic actuator fitted on top. It is a valve assembly remotely and automatically controlled by pressurised air. In a double-acting actuator, the valve is rotated by air in both opening and closing directions. As there is no spring, it delivers the same torque with a smaller actuator and operates quickly; when air is cut off, the valve remains in its last position.
The actuator body is aluminium extrusion and, thanks to the NAMUR interface, solenoid valve, limit switch (position switch) and positioner can be mounted directly. Supplied in DN25–DN600 with stainless steel, nickel-plated or bronze disc and EPDM, NBR, Viton or PTFE seal options. Actuator size is selected according to valve bore, diameter and line pressure.
Advantages
- More compact and economical actuator for the same torque
- Quick quarter-turn opening and closing
- Holds last position when air is cut off
- Solenoid and limit switch installation via NAMUR interface
- Diverse disc and seal options
Application Areas
- Process automation and PLC-controlled lines
- Water treatment and filter backwash systems
- Pump stations
- HVAC and cooling towers
Technical Specifications
| Nominal diameter | DN25–DN600 |
|---|---|
| Actuator type | Pneumatic, double acting |
| Safety position | None (remains in last position) |
| Actuator connection | ISO 5211; NAMUR solenoid interface |
| Control fluid | Dry and filtered compressed air |
| Options | Solenoid valve, limit switch, positioner |
| Operating pressure | PN16 (up to DN300); PN10 (large bores) |
| Connection | Wafer (between two flanges) |
Materials
| Body | GG-25 cast iron or GGG40 ductile iron, epoxy painted |
|---|---|
| Disc | AISI 316 stainless steel, nickel-plated ductile iron or aluminium bronze |
| Stem | AISI 420 stainless steel |
| Seal | EPDM, NBR, Viton (FKM) or PTFE |
| Actuator body | Aluminium extrusion, aluminium cast pistons |
| Actuator seals | Nitrile rubber (NBR) |
Why ORFA?
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